A Formula Three Pixels Matching Steganography Algorithm

TPM (three pixels matching) steganography adopted three pixels as an embedding unit, and extraction function was defined by minimizing the distortion of pixel value along with low pixel value difference distortion. Based on TPM, we proposed formula three pixels matching (FTPM) steganography in this paper. A formula is used to get the stego image pixel pair without searching the neighborhood set for the given image pixel pair and the embedded path selection of the secret information is implemented by the chessboard coverage algorithm. This method can embed digits in any notational system and protect the privacy of the embedded information. The experimental results and analysis show that the proposed method is flexible in the process of information hiding, and no extra storage space is required, while it also ensures the image quality.